I never picked up but they left a voice mail saying that there have been a lawsuit against me and they are the IRS. Such scams.
Below is a small paragraph copied from the irs gov website to help you identify any scams so please do not freak out. For those of you who don't know:
"Any one of these five things is a tell-tale sign of a scam. The IRS will never:
1. Call to demand immediate payment, nor will we call about taxes owed without first having mailed you a bill..
2. Demand that you pay taxes without giving you the opportunity to question or appeal the amount they say you owe.
3. Require you to use a specific payment method for your taxes, such as a prepaid debit card.
4. Ask for credit or debit card numbers over the phone.
5. Threaten to bring in local police or other law-enforcement groups to have you arrested for not paying."